Unit #3 Quiz #1 2013-2014

1. Unit #3 Quiz #1 2013-2014 Grade: «grade» Aquatic Science Subject: «date» Date:

2. 1 At a neutral pH, which molecule is in the highest concentration A carbonate B bicarbonate C carbonic acid D carbon dioxide

3. 2 Which of the following describes the behavior of a hydrophobic substance: A A solution that easily mixes into salt water B A salt sample is added to fresh water & it quickly dissolves C A solution is added to a water sample and the solution floats on top of the water D A large sample of sugar is added to fresh water, but does not dissolve until heat is applied to the mixture

4. 3 Which of the following makes up the smallest percent of global freshwater: A glaciers B permafrost C groundwater D surface & atmospheric water

5. 4 Which of the following is considered an indicator species: A daphnia B hydra C diatoms D amoebas

6. 5 Which of the following is NOT a protist: A Hydra B Amoeba C Euglena D Paramecium

7. 6 When considering the carbonate buffering system, all of the following reactions involve hydronium, EXCEPT: A HCO3- --> CO32- B CO32- --> Limestone C H2CO3 --> HCO3- D CO32- --> HCO3-

8. 7 H2CO3 is A carbonate B bicarbonate C carbonic acid D carbon dioxide

9. 8 HCO3- is A carbonate B bicarbonate C carbonic acid D carbon dioxide

10. 9 You leave a petri dish full of universal nutrients exposed to the air in the classroom for 24 hours, and then incubate the dish for 48 additional hours. When you type the bacteria found within dish, you discover that there is a very high concentration of two different types of bacteria. This is an example of: A High species richness B High species abundance C Both high species abundance and species richness D Both low species abundance and species richness

11. 10 Which of the following is an example of molecular dissociation: A H+ + OH- --> H2O B H2O --> H+ OH- C Fe + CuSO4 --> Cu + FeSO4 D AgNO3 + HCl --> HNO3 + AgCl

12. 11 Which of the following describes alkalinity: A A system’s ability to deal with the addition of a catalyst B A system’s ability to deal with the addition of hydroxide C The sum of all hydronium and hydroxide during the dissociation of water molecules D The sum of equivalents of all species that can neutralize an acid

13. 12 Microbes account for about ________% of all the biological mass on Earth. A 98% B 75% C 50% D 22%

14. 13 As carbonic acid becomes carbonate through the carbonate buffering system, which molecules are released A hydronium B hydroxide C carbonate D salt

15. 14 Which element is always associated with organic compounds: A salt B carbon C oxygen D hydroxide

16. 15 At an average ocean pH (8), which molecule is in the highest concentration A carbonate B bicarbonate C carbonic acid D carbon dioxide

17. 16 Approximately _______% of the planet's water is fresh water. A 2.5 B 10 C 25 D 46

18. 17 Which of the following describes a microbe's prime niche A An environment that has a high amount of competition for resources B An environment that has enough nutrients for the microbe to survive C An environment that has enough nutrients for the microbe to thrive D An environment that lacks any usable nutrients and is inhospitable to microbes

19. 18 Hydrophilic means A "water changing" B "water hating" C "water fearing" D "water loving"

20. 19 CO32- is A carbonate B bicarbonate C carbonic acid D carbon dioxide

21. 20 The following image demonstrates: A high species richness but low abundance B high species abundance but low richness C high species richness and high species abundance D low species richness and low species abundance